winch-ester disk

Winchester disk

noun Computers.
a hard disk that is permanently mounted in its unit.
Also called Winchester.


Origin:
1970–75; originally an IBM code name; the designation for a device containing two such disks was 3030 (each disk containing 30 megabytes), the same as the model number of a well-known Winchester rifle

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World English Dictionary
Winchester disk
 
n
a type of hard disk in which disks are permanently sealed, together with read-write heads, in an airtight container to keep dust out
 
[C20: named after the 3030 Winchester rifle, as the original device would have had 3030 as its IBM number]

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